Bone meal consists mainly of calcium phosphate (Ca3P04). It varies in composition, depending on method of manufacture. Poultry bone meal, sometimes called raw bone meal or steamed bone meal, consists of bones which have been thoroughly cooked, dried, and ground. This product contains 20 to 25 per cent protein.
Bone meal is added to poultry starting and growing rations which contain less than about 10 per cent animal protein feedstuffs and is an important ingredient of mineral mixtures that are often sold separately.
Special steamed bone meal is a by-product of gelatin or glue manufacture. It is cheaper than poultry or steamed bone meal and is as satisfactory as a mineral feedstuff. It contains more calcium and phosphorus and much less protein than poultry bone meal.
Fertilizer bone meal is unpalatable, has a disagreeable odor, and is unsuitable for a poultry feedstuff.